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Hi Gordon - you can use a validation rule to 'lock' a field on the record, but you'll need to provide some additional criteria for us to help define it.
When should the sale amount be modified, is it the same date as the close date (if this is an opportunity object) or is there just one edit that should be allowed after a certain status change and then its locked?
An example of the VR would be:
And(ISChanged(Amount),Today()>CloseDate, Text(StageName)='Closed Won')
This one would throw an error if any changes were made the amount field after the close date if the record was closed won.
